How to set empty message when AllowCustomText is set to false in radcombobox

How to set empty message when AllowCustomTextis set to false in Radcombobox

Description

Recently i faced problem in radcombox which is product of telerik. Telerik products are gaining popularity day by day .So i feel that if someone has this problem then it might be help him.

Radcombobox has a property called AllowCustomText which means user can type something and result will be shown in dropdown .Radcombobox has also a property called EmptyMessage means when nothing is selected empty message will be shown.Example you set "select" as empty message then it will display when nothing is selected.

But problem is that i want to show this empty message but i want AllowCustomText to be false.Then if AllowCustomText is false then set empty message isn't working.I got a solution that is to make AllowCustomText as true and don't allow user to type something in combo.Here I am giving the code